Drilling mechanism



June 25, 1929;y Q F OSGOOD 1,718,430

l DRILLING I MECHANISM Filed March l5, 1924 :s N 'w N A 4 5 z Stg "b N N 32 f w v .i pf, v l v5 Q m g I 'QR/ .III Lbtg/ 1| m i 5/ V y SQ e s?" Y QQ I- a? w W W n 1 m N i l 1 ha.

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Patented lJune 25, 1929.

UNITED STATES PATENT OFFICE.-

CHARLES E. osGooD, oF CLAREMONT, NEW HAMPSHIRE, AssIGNoR To SULLIVAN MACHINERY COMPANY, A CORPORATION oF MASSACHUSETTS.

DRILLING MECHANIS'M.

This invention relatesI to drilling mechanism. y

It has for its object to provide an iinproved drilling mechanism. Another object is to provide an improved drilling mechanism having an improved feeding means therefor. A further object is to provide an improved automatic feeding means. A still further object is to provide animpijoved feeding mechanism controlled by the operation of the drilling motor. A still further object is to provide'an improved feed control mechanism which is responsive to vibrationsset up in the drilling motor. An-

' other object is to provide. an improved feed control mechanism in combination with a pressure fluid actuated feed piston.

In the accompanying drawings I have shown for purposes of illustration two forms which my invent-ion may assume in practice.

In these drawings,`

Fig. l is a side' elevation partly broken away to show details of construction.

Fig. 2 is an enlarged fragmentary vei'ti` cal longitudinal section through the feed piston.

Fig. 3 is a modified form of feed control means adapted to perform the same functions as the form shown in Fig. 2.

Fig. 4 is a transverse vertical sectional view taken substantially on line 4 4 of Fig. l.

In the illustrative form of my invention IV have shown the same embodied in a drifter type of drill comprising a combined supporting shell and feed cylinder l having a suitable clamping bracket 2 and longitudinally disposed guideways 3 Within which the drilling mechanism 4 is slidably mounted as by gibs 5. The drilling mechanism is shown as comprising a usual cylinder 6 having a hammer piston 7 reciprocably mounted therein and extending forwardly from which is a striking bar 8 having flutes on the periphery thereof adapted to cooperate with a chuck nut 9 fixed in the rear endY of a chuck sleeve 10 rotatably mounted within a chuck housing .l1 carried on the front end of the cylinder 6. It will be understood that usual pawl and ratchet mechanism (not shown) is used in combination with the piston 7 to impart rotation thereto and consequently to `the chuck sleeve 10. Carried in the front end of the sleeve 10 is a usual chuck bushing 12 adapted to receive the'shank of a steel 13 formed in the rod ton 7.

Any suitable control valve mechanism generally Vdesignated 14 may be mounted within the rear head l5 of the cylinder 6 to control fluid flow to a fluid distributing valve mechanism generally designated 1 6 and to the leed cylinder 1, in a well known manner. The feeding mechanism comprises an arm 17 projecting rearwardly from the lower side of the head and terminating in de-Y pending arms 18, 19 which carry at their lower end a boss 20 having a. conical bore 21 within which is mounted a plug member 22 held therein as by a nut 23. Threadedly connected to a reduced extension 24 carried by the plug 22 is a. hollow piston rod 25 pro jecting through a rear combined cylinder head and packing member 26. Mounted up'- on the front end of the piston rod 25 is a combined feed controlling valve and piston member 27 While the head 28 closes the front end of the cylinder 1. i

More specifically, the combined piston and feed control valve comprises spaced piston` ends 29 and 30 mounted upon a reduced portion 31 of the piston rod 25, while disposed upon Athe periphery of said reduced portion and between said end members is a valve supporting member comprising an annular port-ion 32 having a radial flange 33 at one end and a recess 34 at its other end to revceive'an annular ring 35 all of which are held in position as by a hollow flanged nut 3 screw threaded into the boi'eof the piston rod 25. The forward end of said nut rests against and holds a head 37 within said bore and which supports a fluid conducting tube` 38 which projects forwardly from a chamber 39 formed in the plug member Slid- .ably mounted within the recess 40 formed by the annular portion 32, flange 33, and member 35 is a valve 41 having a radial expansible spring 42 disposed within an annular groove 43 foi-med in the periphery ofsaid valve and adapted to frictionally engagethe walls of the cylinder l. Formed at the rearv end of the valve 41 and on the inner surfacetliereof is van annular groove 43 adapted to allow communication when in the'position shown in Fig. 2 between radial ports 44, 25 and annular portion 32, andthe rear end of the piston 27 as by ports 45, passages 46 and 47 formed respectively in the annular portion 32 and end the speed of reciproeation of V.tlirough any .suitable vent passage "reciprocation of the piston member .It is to be noted that in the position shown 1n Fig. 2 the valve member 41 will Just barely allow .communication between said respective passages merely to hold ward end of the recess 40, full c'oimnunica tion will be permitted between the ports 44 and 45. In order to allow flow oflive pressure fi'uid to the rear side of the piston 27 to obtain a iforward feed, lLv have provided a passage48 'in the arni 17, leading from the main control valve 14 through depending member v19,`a'r`id which communicates with a passage 49 formed inthe plug 22, the hollow portion ofthe pistonrod, ports 44, annular groove 43', ports I45, passages 46 and 47 to the rear side ofthe piston During this operation, the front side of the piston 27 is vented to the atmosphere as through the hollow portion ofthe nut 36, passage 38, chamber 3S), iassagejOfoiined in the arm 17 and depending member 18, and to the atmosphere as (not shown) in the valve 14. lt is to be noted, however, that it is possible to ventthe rear sideof piston 27 and allow flow of live pressure "luidto the front side to impart reverse feeding movement tothe mechanism. i l

`ln the operation of my device the valve 14 will be turned to one position whereby pressure actuating fluid will flow through the distributing valve mechanism 1G to cause v7 and n consequently rotation of Vthe steel 13 in a usual manner. l (assuming forward feed) through the pas* sages 48, 49, thc hollow portion of the rod 25and out through the ports 44 to the rear side of the piston 27 as before described. VDuring this operation the piston 7 will set up vibrations within the drilling mechanism due to the recoil of thepiston 7 upon striking the steel 13. These ,vibrations will cause slight reciproeation of the piston rod l25, the result being a relative movement between the frictionally held valve member 41 and the annular portion 32 such as to permit al greater opening between the ports 44 and 45 hence allowing a, greater amount of 'flow .of live pressure fluid to the rear side of the piston 27 to feed the machine forwardly. It will thus beV seen that the greater vnumber of recoil vibrations the piston 7 sets up, which is proportional to p the piston 7 there will be a. greater rate of feed due to ,the fact that the valve V41 willv also move a Y greater number of times and thereby allowv Vamount Vof fluid flow per unit.

aV greater of time than if a low vibration were set up due to a slow speed of the piston 7.

Dur-ing the operation of the drilling mechanism if the steel encounters soft mate- At the same time, fluid will `flowk great Vas though the steel encountered hard rock. The result is the piston 7 is slowed down with a consequent reductionof vibration and also a reduction offluid flow to the rear side of the piston 27 due to slower valve movement thereby reducing the amount of feed. lt often occursvthat the steel will encounter material' which will offer varying degrees ofresistance to the steel rotation, which resistancev also varies the speed of reciprocation of the piston V7 with aconsequent reduction of ration and flow of iiuid for forward feeding; lf it is now desired to reverse the feed valve 14 will beV thrown to reverse position whereby the 'boreof the i'o`d25 will be vented to atmosphere in a usual manner and fluid admitted to the front side of the piston as through the passage Vand tube SSftof feed the mechanism in a reverse direction. During initial reverse movement of piston 27, valve 41 will be'fric'tionally held until engaged by the ring 35' at which time the annular groov 43 will allow confiplete communication between ports 44 and 45, hence completely venting the rear side of the piston 27 to atmosphere.

ln the modified form of my controlling valve as shown in Fig. 3, an annular ring 51 is disposed between the` end members 29Y and 30 of the piston and held therein as by a nut 36 identical to that shown in Fig. 2. Formed in the member 51 is alon 'tudinally ydisposed* bore 52 withinwhich isV disposed a spring pressed valve 53 held therein by a threadedplug 54.` In order to allow flow of 'fluid from the vhollow portion of the piston rod 25 through ports and 45, l have provided an annular groove 55 in the periphery of the vvalve 53,- it being noted that in the position of the valve shown in Fig. 3 the right hand shoulder' thereof does not quite vcover the port 44 so that a slight flow of fi'uid may be hadto the rear side of thepiston 27 as was also possible in the preferred form shown in Fig. 2. The spring chamber 52 is vented by means of a passage .56 communicating with the bore of the feed cylinder in advance of the feed piston 27. Upon recoil of the piston 7 the piston 27 willrbe moved rearwardly and dueto the inertia of the valve 53, there will be a relative movement between the same and its bore with the result that there will be a greater opening betweenports 44, and 45 to allowa greater flow vof fluid. The remaining-*operation of this modified form is generally similar to that of the preferred forni.

VVh-ile I have in this application specificallyl described two forms which (my invention may assume in practice, it will be understood that these forms of the same are shown for 'purposes of illustration and that the lOl) its spirit or the scope of the appended claims. What I claim as new and desire to secure by Letters Patent is:

1. A drilling mechanism comprising a drilling motor and fiuid operated forward l'eeding` and retracting means therefor including relatively reciprocable cylinder and piston elements, means for controlling the supply of pressure fiuid to opposite sides of the feed piston for forward and reverse feeding, and supplemental means for controlling fluid supply for effecting one direction of feeding including a fiuid controlling mem ber dependent upon the vibrating action in said mechanism and controlling fluid flow to said feed cylinder to vary the feeding pressure in accordance with the requirements of the work during drilling, While the other direction of movement is independent of said vibratory action.

2. A drilling mechanism comprising a drilling motor and pressure fluid operated forward feeding and retraction means therefor including a feed cylinder having a longitudinally movable piston therein, means for controlling the supply of pressure fluid to opposite sides of the feed piston for forward and reverse feeding, and supplemental means for controlling fluid supply for effecting one movement of said piston including a fluid controlling member dependent upon the vibrating action in said mechanism for controlling fluid flow to said feed cylinder to vary the feeding pressure in accordance with the requirements of the work during drilling, while the other movement is independent of said vibratory action.

3. Drilling mechanism comprising a reciprocable hammer piston, feeding means including a feed cylinder having a fluid actuated piston, and means carried by said latter piston and dependent upon vibrations set up` byv said hammer piston for controlling fluid flow to said feed cylinder for varying the feeding pressure in accordance with the requirements of the work during drilling.

4. A drilling mechanism comprising a reciprocable hammer piston, pressure fiuid operated forward andreverse feeding means therefor including a feed cylinder having a fluid actuated piston, means carried by the latter piston and dependent upon vibrations set up by the hammer piston for controlling Huid flow to the feed cylinder for varying said pressure in accordance with the requirements of the work during drilling, and means whereby upon reverse movement said latter means is inoperative.

5. A drilling mechanism comprising an impact motor, pressure fluid actuated feeding means therefor including relatively reciprocable feeding elements, and valve means continuously open during drilling and variably actuated by the varying recoil of the impact motor when drilling including a member carried by one of said elements, and a cooperating member frictionally engageable with the other element for automatically controlling said feeding means in accordance with the requirements of the Work.

In testimony whereof I aflix my signature.

CHARLES F. OSGOOD. 

